Questions & Answers about Tão caro que está o peixe!
Why does this sentence use Tão (so) instead of a word for "how"?
Why use está (from estar) instead of é (from ser) for "is"?
We use estar because the price of fish fluctuates; it is a temporary state. Saying está means the fish is expensive right now at the market or these days. If you used é, it would imply that fish is an inherently expensive luxury item all the time.
What is the word que doing in the middle of the sentence?
Could I just say O peixe está tão caro with normal word order?